German publication Autobild has reportedly acquired some powertrain details about a few upcoming Audi models, including the S6, S7 and S8. Apparently we can expect a twin-turbocharged V8 packing up to 500 horsepower in the S8, while the S6 and S7 will get 440 and 470 horsepower, respectively.

Toward the end of 2012, Audi will unleash the RS6, which will carry a BMW M5-besting, 580-horsepower version of the same twin-turbo mill powering the S6. We still don't know how big the proposed engine is – earlier reports have suggested that a 4.0-liter V8 is in store – but it should get 20 percent better fuel economy than the outgoing naturally aspirated V10.

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I am interested in seeing how good of an engine this will be. With the combination of reports and rumors, the twin turbo 8 will proliferate similar to how the supercharged 3.0 is throughout the line-up today. That being said, hopefully it will have a good combination of power, efficiency and quality.

Audi S models compete with C+S class and 3/5/7 series, G37 and the like. If these numbers are true and Audi is also decreasing weight like they say with available AWD and typical Audi interior features like B&O sounds systems, these will decimate pretty much everything on lots today short of AMG and M cars which are in a different pricing class. It could also be they are no longer underrating their cars pretty rating them close to output, , anyone who has driven an S4 will tell you it is more than 300HP.

The S4 is clearly aimed at the similarly priced 335xi, and it's got a more proven AWD and 33 more horsepower.
The S5 is aimed at a better-optioned 335is, since it comes with more features, and it packs 30 more horsepower, and AWD.
The RS5 is marginally more expensive than the M3, but it's faster, and again, packs AWD.
Audi cars are a bit more expensive than their BMW counterparts, but they offer AWD and more options.

You really need to get your facts straight. A loaded M3 is almost $10,000 more than an S5 with similar options. If you option out the cars you will see the S5 lines up with the 335ix coupe and the S4 lines up with the 335ix sedan. Audi adds content to their base cars over what BMW offers. Go price out the cars with exacting option and you will find they just about match up evenly

S5 costs less than an M3. I know what I spent on one, and a friend of mine has an M3 and I know what he spent on his, different price class ... The S5 is comparable in price to a 335 coupe, well, a little more expensive but with a nicer interior ...